<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./vue.js"></script>
</head>
<body>
    <div id="app">
        <button @click="ishot=!ishot">切换天气</button>
        <h1>以下是今天的天气</h1>
        <p v-if="ishot">今天天气很热</p>
        <p v-else>天气11111111111111111很冷</p>
    </div>

    <script>
        Vue.config.productionTip = false;
        const vm = new Vue({    
            el:'#app',
            data(){
                return{
                    ishot:true 
                }
            }
        })
    </script>
</body>
</html>